package com.atguigu.eduservice.listener;

import com.alibaba.excel.context.AnalysisContext;
import com.alibaba.excel.event.AnalysisEventListener;
import com.atguigu.eduservice.entity.EduSubject;
import com.atguigu.eduservice.entity.excel.SubjectData;
import com.atguigu.eduservice.service.EduSubjectService;
import com.atguigu.servicebase.exceptionhandler.GuliException;
import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;

//因为SubjectExcelListener不能交给spring进行管理，需要自己手动new，不能注入其他对象
public class SubjectExcelListener extends AnalysisEventListener<SubjectData> {


    //因为SubjectExcelListener不能交给spring进行管理，需要自己手动new，不能注入其他对象
    //service和mapper都不能注入，不能实现数据库操作
    public EduSubjectService subjectService;

    public SubjectExcelListener() {
    }

    public SubjectExcelListener(EduSubjectService subjectService) {
        this.subjectService = subjectService;
    }


    //读取方法
    //读取excel内容，一行一行进行读取
    @Override
    public void invoke(SubjectData subjectData, AnalysisContext analysisContext) {
        //如果excel中没有数据，就不需要读取
        if (subjectData == null) { // 表示excel中没有数据
            throw new GuliException(20001, "文件数据为空");
        }

        //一行一行读取，每次读取有两个值，第一个值一级分类，第二个值二级分类
        //判断一级分类是否重复
        //添加一级分类
        EduSubject existOneSubject = this.existOneSubject(subjectService, subjectData.getOneSubjectName());
        if (existOneSubject == null) { //表示表中没有相同的一级分类，可以进行添加
            existOneSubject = new EduSubject();
            existOneSubject.setParentId("0");
            existOneSubject.setTitle(subjectData.getOneSubjectName());//一级分类名称
            subjectService.save(existOneSubject);
        } //如果不等于空，则不添加

        //如果表里有值，即existOneSubject不为空，则里面由id；如果表中没有值，那么添加完成后，也能拿到id
        //获取一级分类的id值
        String pid = existOneSubject.getId();
        //添加二级分类
        //判断二级分类是否重复
        EduSubject existTwoSubject = this.existTwoSubject(subjectService, subjectData.getTwoSubjectName(), pid);
        if (existTwoSubject == null) {
            existTwoSubject = new EduSubject();
            existTwoSubject.setParentId(pid);
            existTwoSubject.setTitle(subjectData.getTwoSubjectName());//二级分类名称
            subjectService.save(existTwoSubject);
        }

    }

    //判断一级分类不能重复添加
    //此方法时当前类中调用，所以写成private的就行
    private EduSubject existOneSubject(EduSubjectService subjectService, String name) {
        QueryWrapper<EduSubject> wrapper = new QueryWrapper<>();
        wrapper.eq("title", name);
        wrapper.eq("parent_id", "0");//一级分类是0
        EduSubject oneSubject = subjectService.getOne(wrapper);
        return oneSubject;
    }

    //判断一级分类不能重复添加
    private EduSubject existTwoSubject(EduSubjectService subjectService, String name, String pid) {
        QueryWrapper<EduSubject> wrapper = new QueryWrapper<>();
        wrapper.eq("title", name);
        wrapper.eq("parent_id", pid);
        EduSubject twoSubject = subjectService.getOne(wrapper);
        return twoSubject;
    }

    //完成之后
    @Override
    public void doAfterAllAnalysed(AnalysisContext analysisContext) {

    }
}
